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what you are hearing is the gears in the wiper motor grinding usaly makes a kind of humming vibration and when they do work means thet caught part of the gear thats good. the you wiper motor assembly is woreout and u need a replacement. i hope this helps thanks for your timeand good luck
My Chevy was having troubles with the wipers and had to put a large zip tie around the motor and wiring connection. The post were worn down just enough for it to lose contact. The Zip Tie holds tension on it.
Easy fix. Very very common chevy issue. the wiper motor goes but no wipers, or they work one time and not the next. drove me nuts for two years. It is the wiper control module. The board actually get moisture in it cracks the sod-er joints they are there go get magnifying glass. hair line cracks in the board. how ever good new auto zone advance auto who ever carries the board 30 bucks. located back of the fire wall by the wiper motor. three torx screws. remove torx. care full not to bend prongs when pulling board. replace with new screws and cover and board. seal new cover with silicon rtv so forth to re prevent moisture. when it rains, rain drops on this board by the top crack and will reoccur. but this is sure fix. did my truck and my buddies. Make sure to use silicon or don't waste your time. Been good ever since 1 year now.